汇编中一长串的L是什么意思？

比如这样的RS EQU P3.2
RW EQU P3.3
E EQU P3.4
DAT EQU 30H
DAT1 EQU 31H

      ORG    0000H
      MOV    SP,#60H
      MOV     DAT,#01H      ; CLEAR 液晶显示初始化
  LCALL     ENABLE        ; 如果使用LCD液晶显示,在程序开头必须加上这句
      LCALL  DISP3
      MOV     DAT,#01H      ; CLEAR
  LCALL     ENABLE

      MOV    A,#4CH
      MOV    B,#83H
      LCALL  DISP2
      MOV    A,#45H
      MOV    B,#84H
      LCALL  DISP2
      MOV    A,#45H
      MOV    B,#85H
      LCALL  DISP2
      MOV    A,#57H
      MOV    B,#87H
      LCALL  DISP2
      MOV    A,#41H
      MOV    B,#88H
      LCALL  DISP2
      MOV    A,#56H
      MOV    B,#89H
      LCALL  DISP2
      MOV    A,#45H
      MOV    B,#8AH
      LCALL  DISP2

      MOV     DAT,#0CH      ; 消除光标
      LCALL     ENABLE

KKE1: LCALL KKEYI ;键盘信号搜索
KCACOM: LCALL KCOM1 ; A > 9 执行键盘命令
LJMP KKE1

 ;LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL

KCOM1: CJNE A,#00H,KN88 ; ; 按键K43，控制通道2输出波形的高4位频率字
INC 43H
MOV A,43H
ANL A,#0FH
MOV 43H,A
MOV DPTR,#0003H
MOVX @DPTR,A
LCALL ASC1
MOV B,#0CFH
LCALL DISP2

    MOV    DAT,#0CH      ;
    LCALL  ENABLE   ; 消除光标
    RET

;UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU 键K42 ： 此键控制输入低8位频率字